The DL-300-WF series is an IAQ(Indoor Air Quality) monitoring module with Wi-Fi, Ethernet and RS-485 interfaces. It provides a WLAN connection which complies with the IEEE802.11b/g/n standards. With the popularity of 802.11 network infrastructure, the modules make an easy way to incorporate wireless connectivity into monitoring and control systems. The DL-300-WF series of data logger devices can be used to record CO, CO2, temperature, humidity and dew point information, including date and time stamps, and are able to store up to 450,000 downloadable records.

Real-time data can be accessed from the DL-300-WF data logger from anywhere and at any time using the free Windows software, the iOS App or the Android App, as long as they are connected to the same local network as the data logger. Support is provided for popular industrial protocols such as DCON, Modbus RTU, and Modbus TCP, as well as the emerging machine-to-machine (M2M)/)IoT (Internet of Things) connectivity protocol – MQTT. The DL-300-WF Data Logger can be connected via widely used communication interfaces including RS-485, Ethernet and PoE, meaning that the device can be easily integrated into existing HMI or SCADA systems, and is easy to be maintained in a distributed control system.


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  • Simultaneous Display for CO, CO2, Temperature, Humidity and Dew Point
  • Non-dispersive Infrared (NDIR) CO2 Sensor
  • 2.8″ LCD Touch Screen
  • Able to store up to 450,000 records with date and time stamps
  • Touch-screen and Web-based Configuration Interface
  • Simple and Powerful Software Utility, iOS APP and Android App Included
  • Able to Display Multilingual Messages on the Screen
  • Supports the DCON, Modbus RTU, Modbus TCP and MQTT Protocols
  • Includes RS-485/Ethernet/Wi-Fi Communication Interfaces
  • Compatible with IEEE802.11b/g/n standards
  • Support infrastructure and limit-AP modes for wireless networks
  • Relay Output for Audible/Visual Alarm or IAQ Device Control
  • Includes redundant power inputs: PoE (IEEE 802.3af, Class 1) and DC input
  • Desktop, DIN-Rail or Wall Mounting
  • Transportation of Food or Pharmaceuticals
  • Food and Beverage Industry (HACCP)
  • Blood Stations and Pharmacies
  • Building and Energy Management
  • Warehouse Management
  • Museums, Archives and Galleries


Models DL-301-WF DL-302-WF DL-303-WF DL-307-WF
HCHO Measurement
Range 0 ppb to 2000 ppb (Electrochemical)
Resolution 1 ppb
Accuracy 0 ~ 300ppb : ±30ppb
> 300ppb : ±10%
Response Time ≤60 seconds
Warm-up Time 180 seconds
TVOC Measurement
Range 0 ppb to 60000 ppb
(MEMS Metal Oxide)
Resolution 1 ppb
Accuracy ±15%
Response Time 60 seconds
Warm-up Time 180 seconds
CO Measurement
Range 0 to 1000 ppm (Electrochemical) 0 to 1000 ppm (Electrochemical)
Resolution 1 ppm 1 ppm
Accuracy ±5% of measured value ±5% of measured value
Response Time 30 seconds 30 seconds
Warm-up Time 300 seconds 300 seconds
CO2 Measurement
Range 0 to 9999 ppm (NDIR)
Resolution 1 ppm
Accuracy ±40 ppm ±3% of measured value
Response Time 120 seconds
Warm-up Time 300 seconds
Temperature Measurement
Range -10 to +50°C
Resolution 0.1°C
Accuracy ±0.6°C
Relative Humidity Measurement
Range 0 to 100% RH, Non-condensing
Resolution 0.1% RH, Non-condensing
Accuracy ±5% RH, Non-condensing
Dew Point
Range Calculated using temperature and relative humidity
Resolution 0.1°C
CO Alarm Yes Yes
CO2 Alarm Yes Yes
Real Time Clock Yes
Data Logger Yes, 450,000 Records
Alarm Relay Output Form A×1, SPST. 30 VDC @ 16 A or 250 VAC @ 16 A
Built-in Web Server Yes
Wi-Fi Interface
Antenna Antenna = 1 dBi (PCB Antenna)
Output Power 18 dBm @ 1 DSSS, 14.5 dBm @ 54 OFDM
Receive Sensitivity -95.7 dBm @ 1 DSSS, -74.0 dBm @ 54 OFDM
Standard Supported IEEE 802.11 b/g/n
Wireless Mode Infrastructure & Limited AP
Encryption WEP, WPA and WPA2
Transmission Range 50 meters (LOS)
Powered from Terminal Block +12 to +48 VDC
Powered from PoE IEEE 802.3af, Class 1 (48 V)
Power Consumption PoE 1.8 W (Max.) 1.8 W (Max.) 1.9 W (Max.) 1.8 W (Max.)
Non-PoE 1.7 W (Max.) 1.7 W (Max.) 1.8 W (Max.) 1.7 W (Max.)
Dimensions (L x W x H) 114 mm x 106 mm x 56 mm
Installation Desktop, DIN-Rail or Wall Mounting
Operating Temperature 0 to +50°C
Storage Temperature -30 to +75°C
Humidity 10 to 90% RH, Non-condensing


Large 2.8″ LCD Touch Screen, with clear Color Chart to indicate the CO/CO2 Level

Simple and Powerful DL-300 Utility

The DL300 Utility can be used to configure the modules, monitor real-time data, group DL-300 modules so that the status of distribution groups can be viewed and managed. The utility also allows the log data to be downloaded and exported to a .CSV file that can then be imported into any industrystandard software or spread sheet for analysis.

Multi-platform Remote Access Software
Real-time data from the DL-300 Data Logger can be accessed from anywhere and at any time using the DL300 Utility, the iOS or Android App, or via a regular web browser, as long as they are connected to the same local network as the Data Logger.


Supports the MQTT Protocol for IoT Applications
(Ethernet Interface Only)

Real-time data from the DL-300-WF series can be accessed from anywhere and at any time using the WF-IIOT-Utility and iOS App.


▲ Android APP QR CODE
Display Messages in Multiple Languages
The display-message-on-screen function supports multiple language character sets based on UTF-8 encoding. Either pre-configured messages or dynamic messages can be remotely displayed using Modbus commands, or a dynamic message can be sent via the web-based interface.

▲ WiFi_IIOT_Utility

Ordering Information

DL-301-WF CR  Remote CO/Temperature/Humidity/Dew Point Data Logger with Ethernet/RS-485/Wi-Fi Interfaces and PoE (RoHS)
DL-302-WF CR  Remote CO2/Temperature/Humidity/Dew Point Data Logger with Ethernet/RS-485/Wi-Fi Interfaces and PoE (RoHS)
DL-303-WF CR  Remote CO/CO2/Temperature/Humidity/Dew Point Data Logger with Ethernet/RS-485/Wi-Fi Interfaces and PoE (RoHS)